As you make games, you will find yourself wanting to make cause-effect relationships like the following:

• If a player scores 10 points, then they win the game.
• If a player has a power-up, then they can run super fast.
• If a player says “Happy Birthday” in chat, then sparkles appear.

All of these relationships need a conditional statement, lines of code that only run if certain conditions are true. One type of conditional statement is an if/then statement that checks to see if something is true before running instructions.

Practicing Conditional Statements

In this code example, a part will change transparency whenever the statement is true. Let’s practice with an obviously true statement like 3+3 = 6. Since this statement is true, the next line of code will run.

Set up the Part and Script

1. In ServerScriptService, create a new script named IfThenScript.

2. Create a new part named IfThenPart.

3. Delete Hello World in the script and write a comment at the top.

   

Code the Condition

The condition in this case is if 3 + 3 is equal to 6, then something else will happen. To create this condition:

1. Type lowercase if 3+3

   

2. After 3+3, type ==

   

3. After ==, type 6. This is what you’ll check against. If you’re using other numbers, make sure the condition is true, like 10 - 4 == 6.

Code the Statement

After making the condition, the script needs a statement that’ll happen when that condition is true. In this case, the part will change transparency whenever the condition is true.

1. After if 3+3 == 6, type then

   

2. Press Enter to autocomplete the if statement with end

   

3. Between then and end, type game.Workspace.BrickName.Transparency = .5

   

4. Test your code. Check that the part has changed transparency.

   

Check a False Condition

Now, purposely change the statement to see what happens when the math equation is false.

1. Change if 3+3 == 6 then to if 3+3 == 10 then

2. Test your code now. The part will no longer change transparency because the statement is no longer true.

   

Making Other Comparisons

Instead of checking if two numbers are equal, you can also multiply, add, subtract, or make other comparisons. Depending on the games you make, one might be more useful than another.

Math Operators

Comparison Operators

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